Structures of rare earth-transition metal rich compounds derived from CaCu5 type

The properties of materials have a close connection to their crystal structures. Rare earth (R)-transition metal (T) rich compound are the focus of investigation in the search for new hard magnetic materials. As the basis for the study of stabilized effect of the third component on the formation of RT5 derivative and its influence of the occupied sites on magnetic properties, in this paper, the possible derivative compounds based on the RT5 primitive unit cell of the CaCu5 structure type formed through the ordered or disordered substitution of dumbbell pair 2T atoms for the R atoms at some sites, and the structural relationship between the derivatives and the prototype are summarized.